Chemical Bonding & Periodicity

*Answer can only contain numeric values

QUESTION: 1

The number of species having 3c-2e- bond among following is/are____
Al₂(CH₃)₆, AI₂(CH₃)₄CI₂,(MgH₂)₂, AI(BH₄)₃, BeCI₂(in solid)

Solution:

Species in which ligands are electron deficient (one electron) form 3c–2e^–bonding.

*Answer can only contain numeric values

QUESTION: 2

The percentage s-character in lone pair in PH₃ molecule having bond angle 92º is _____________

Solution:

Hence, s-character in lone pair 100-9.6 = 90.4%

QUESTION: 3

Correct order of ionization energy among following is/are
(I) N₂ > N > O (II) N > O > O₂ (III) N₂> O₂> NO (IV) N₂ > C₂ > O₂

A.
I, II, III
B.
II, III, IV
C.
I, III, IV
D.
I, II, III, IV

Solution:

Energy required for removing electron from orbitals follows the order ABMO < A.O. < B.M.O.

QUESTION: 4

Species having highest v_p-o value is

A.
Br₃P =O
B.
Me₃P = O
C.
Ph₃P = O
D.
F₃P = O

Solution:

As the electronegativity of substituted v_P-O also increases

QUESTION: 5

Correct order of bond angle from following?

A.
NO⁺₂> NO^-₂> NO₂
B.
[NH₄]⁺> [PH₄]⁺> OH₂> OF₂
C.
OCI₂> OF₂> OH₂
D.
[PH₄]⁺ = [NMe₄]⁺> H₃O⁺> OF₂

Solution:

Energy required for removing electron from orbitals follows the order ABMO < A.O. <B.M.O.

QUESTION: 6

The HOMO in molecule

A.
σ-bonding
B.
σ^* - bonding
C.
Non-bonding
D.
π-bonding

Solution:

Molecular orbital diagram of

Hence both are gerade.

QUESTION: 7

Correct set of point group for BrF₅, and [BrF₆]⁺ respectively are-

A.
D_3h, C_4V and O_h
B.
C_4v, D_3h and O_h
C.
C_4v, D_4h and O_h
D.
C_4v, D_2d and O_h

Solution:

QUESTION: 8

The correct statement is

A.
In CH₂F₂the F-C-F bond angle is larger 109º28’
B.
In CH₂F₂ the C-F bond has more than 25% s-character
C.
In CH₂F₂ the H-C-H bond angle is larger than 109º28’
D.
In CH₂F₂ the C-H bond has less than 25% s-character

Solution:

Lesser the electronegativity of surrounding atom more s-character in that bond. Hence, more bond angle.

*Answer can only contain numeric values

QUESTION: 9

The maximum number of atoms that may lie in the same plane in molecule P(CH₃)₃(CF₃)₂ is _______

Solution:

*Answer can only contain numeric values

QUESTION: 10

Number of molecule that show fluxional behavior among. CH₄,CF₄,PCI₅,PF_5,BrF₅,SF₆,XeO₃ is _________

Solution:

*Answer can only contain numeric values

QUESTION: 11

The number of anions having perfect O_h geometry among
[SbCI₆]^3-, [SeCI₆]^2-,[TeBr₆]^2-,[BrF₆]^-,[IF₆]^-,[CIF₆]^-,[SeF₆]^2- is/are__________

Solution:

Lesser the difference between size of central and surrounding atom lesser will be stereochemical activity of lone pair. Hence, perfect geometry.

QUESTION: 12

HOMO and LUMO in BeH₂molecules respectively are

A.
both gerade
B.
both ungerade
C.
ungerade and gerade
D.
gerade and ungerade

Solution:

Molecular orbital diagram of BeH₂.

QUESTION: 13

Regarding following compounds A,B,C and D

Correct statement(s) is/are

A.
I and III
B.
II and IV
C.
I, II and IV
D.
I, II and III

Solution:

More the S-character in C-O bond = more will be strength of bond. Hence, more will be v_c-o value. Hence, more ionization energy and lesser the dipole moment.

QUESTION: 14

The ionisation potential of hydrogen atom is 13.6 eV. The first ionisation potential of a sodium atom, assuming that the energy of its outer electron can be represented by a H-atom like model with an effective nuclear charge of 1.84, is

A.
46.0 eV
B.
11.5 eV
C.
5.1 eV
D.
2.9 eV

Solution:

QUESTION: 15

In salt [Et₄N]₂[InCI₅] and [NH₃(CH₂)₅(NH₃)][TiCI₅], structures of anions respectively are

A.
Trigonal bipyramidal and square pyramidal
B.
square pyramidal and trigonal bipyramidal
C.
both square pyramidal
D.
both trigonal bipyramidal

Solution:

These structures are due to crystal packing effect.

QUESTION: 16

Select the correct statement regarding [Ph₃MeP][AI(BH₄)₄]
(I) At 298 anion show one signal in ¹H NMR
(II) At 298 anion show two signal in ¹H NMR
(III) At 298 a quintet is observed in¹¹B NMR
(IV) At 298 a triplet of triplet is observed in ¹¹B NMR

A.
I and III
B.
I and IV
C.
II and IV
D.
II and III

Solution:

Structure of [AI(BH₄)₄]^-

At 298 terminal and bridging hydrogens are involved in dynamic process. Hence, one signal in ¹H NMR. ¹¹B NMR will be a quintet regarding 4 equivalent H.

QUESTION: 17

The ground state terms for H⁺₂ and No respectively.

A.
²∑_g and ³∑_g
B.
²∑_gand ²π_g
C.
³∑_g and ²π_u
D.
³∑_g and ²∑_g

Solution:

Hence,²π_g

QUESTION: 18

²⁹Si NMR spectrum of X[Ph₃SiH₂] shows

A.
doublet of doublet
B.
triplet
C.
doublet of triplet
D.
triplet of triplet

Solution:

Structure of X[Ph₃,SiH₂]

Hence, triplet

QUESTION: 19

Geometry and point group regarding [ZrMe₆]^2-

A.
Octahedral and O_h
B.
Distorted trigonal prismatic and C_3v
C.
Regular trigonal prismatic and D_3h
D.
Hexagonal and D_6h

Solution:

perfect trigonal prismatic geometry

perfect trigonal prismatic geometry has D_3h point group.

*Answer can only contain numeric values

QUESTION: 20

The final dioxygen (B) undergo Diels Alder reaction unlike normal dioxygen(A). The value of spin multiplicity which represent ground state term of dioxygen (B) is __________

Solution:

2s + 1 = 1, M_l =2
Hence ¹Δ_g

20 Questions MCQ Test GATE Chemistry Mock Test Series | Chemical Bonding & Periodicity

The number of species having 3c-2e- bond among following is/are____
Al₂(CH₃)₆, AI₂(CH₃)₄CI₂,(MgH₂)₂, AI(BH₄)₃, BeCI₂(in solid)

The percentage s-character in lone pair in PH₃ molecule having bond angle 92º is _____________

Correct order of ionization energy among following is/are
(I) N₂ > N > O (II) N > O > O₂ (III) N₂> O₂> NO (IV) N₂ > C₂ > O₂

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